Limit wave
When SSB is frequency band between 1605 kHz and 3800 kHz named because it on the "border" between medium wave and short wave is.
In English-speaking countries, these frequencies are assigned to either medium frequency (MF, frequencies below 3000 kHz) or short wave (high frequency, HF, frequencies above 3000 kHz). During the day, it spreads mainly via the bump (range below 500 km); from dusk onwards, also through the no longer dampened sky wave (range up to approx. 4000 km). For commercial radio services, the limit wave has lost its importance due to satellite navigation and satellite telephony. Radio broadcasts are still broadcast in the tropics (Indonesia) in the area of the border wave. In broadcasting, one speaks of the tropical band, the frequency range of which largely overlaps that of the boundary wave. What change in meaning the Grenzwelle will achieve through the digitization of narrowband radio technology ( Digital Radio Mondiale (DRM)) is completely open.
Amateur radio
The amateur radio band at 1800 kHz ( 160 meter band ) is usually assigned to the medium wave range.
Marine radio
In the mobile maritime radio service , the wave radio is still important. Ships requiring equipment according to SOLAS must be equipped with a boundary wave radio system in sea areas A2 to A4. The international emergency and calling frequency for analog radio traffic is 2182 kHz, the DSC frequency 2187.5 kHz, the Telex frequency 2174.5 kHz.
literature
- Frequency plan of the Federal Network Agency